期刊
NANO LETTERS
卷 20, 期 1, 页码 509-516出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.9b04247
关键词
Chirality; plasmonic metamolecules; chiral plasmonics; photopolymers; circular polarization
类别
资金
- Agence nationale de la Recherche (ANR) [ANR-17-CE24-0039, ANR-13-BS10-0013-03, ANR-15-CE24-0036-01]
- Chinese Scholarship Council
- Ministere de l'enseignement superieur et de la Recherche
- Region Grand Est
- Conseil General de l'Aube
- FEDER funds from the European Community
- HPC Center of Champagne-Ardenne ROMEO
- Agence Nationale de la Recherche (ANR) [ANR-17-CE24-0039, ANR-13-BS10-0013, ANR-15-CE24-0036] Funding Source: Agence Nationale de la Recherche (ANR)
When circularly polarized light interacts with a nanostructure, the optical response depends on the geometry of the structure. lithe nanostructure is chiral (i.e., it cannot be superimposed on its mirror image), then its optical response, both in near-field and far-field, depends on the handedness of the incident light. In contrast, achiral structures exhibit identical far-field responses for left- and right-circular polarization. Here, we show that a perfectly achiral nanostructure, a plasmonic metamolecule with trigonal D-3h symmetry, exhibits a near-field response that is sensitive to the handedness of light. This effect stems from the near-field interference between the different plasmonic modes sustained by the plasmonic metamolecule under circularly polarized light excitation. The local chirality in a plasmonic trimer is then experimentally evidenced with nanoscale resolution using a molecular probe. Our experiments demonstrate that the optical near-field chirality can be imprinted into the photosensitive polymer, turning an optical chirality into a geometrical chirality that can be imaged using atomic force microscopy. These results are of interest for the field of polarization-sensitive photochemistry.
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